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首页> 外文期刊>Nature reviews Cancer >Steady-state visually evoked potentials reveal partial size constancy in early visual cortex
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Steady-state visually evoked potentials reveal partial size constancy in early visual cortex

机译：稳态视觉诱发潜力揭示了早期视觉皮层中的部分尺寸常量

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摘要

Our visual system maintains a stable representation of object size when viewing distance, and thus retinal size, changes. Previous studies have revealed that the extent of an object's representation in V1 shows systematic deviations from strict retinotopy when the object is perceived to be at different distances. It remains unknown, however, to what degree V1 activity accounts for perceptual size constancy. We investigated the neural correlates of size-constancy using steady-state visually evoked potentials (SSVEP) known to originate in early visual cortex. Flickering stimuli of various sizes were placed at a viewing distance of 40 cm and stimuli twice as large were shown at 80 cm. Thus both sets of stimuli had identical retinal sizes. At a constant viewing distance, SSVEP amplitude increased as a function of increasing retinal size. Crucially, SSVEP was larger when stimuli of a given retinal size were presented at 80 cm compared with at 40 cm independent of flicker frequency. Experiments were repeated and extended in virtual reality. Our results agree with previous findings showing that V1 activity plays a role in size constancy. Furthermore, we estimated the degree of the neural correction for the SSVEP as being close to 50% of the perceptual size constancy. This was the case in all experiments, independent of the effectiveness of perceptual size constancy. We conclude that retinotopy in V1 does get quite massively adjusted by perceived size, but not to the same extent as perceptual judgments.
机译：当观看距离时，我们的视觉系统保持对象大小的稳定表示，从而保持视网膜尺寸，改变。以前的研究表明，当物体被感知到不同的距离时，对象在V1中的表示的程度显示出与严格的视网膜监测的系统偏差。然而，它仍然未知，V1活动占感知大小持续的程度。我们研究了稳态视觉诱发电位（SSVEP）源于早期视觉皮质的神经常态的神经相关性。将各种尺寸的闪烁刺激置于40厘米的观察距离，并且刺激两倍于80cm显示。因此，两组刺激都具有相同的视网膜尺寸。在恒定的观察距离处，SSVEP幅度随着随着视网膜尺寸的函数而增加。当给定视网膜尺寸的刺激以80cm的刺激与40厘米无关的闪烁频率相比，SSVEP均较大。在虚拟现实中重复并延伸实验。我们的结果同意以前的研究结果，表明V1活动在规模恒定上发挥作用。此外，我们估计了SSVEP的神经校正程度，接近感知大小恒定的50％。所有实验都是如此，与感知大小持续的有效性无关。我们得出结论，V1中的视网膜能力确实通过感知的规模进行了大量的调整，但在相同程度上作为感知判断。

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